Improvement in door-springs



in. DICK.

` f Door-Sp rings. 0.139,458. eatemedmewvy DAVID DICK, OF NEW YORK, N. Y., ASSIGNOR TO BARBARA BARMORE, 0F SAME PLAGE.

IMPROVEMENT IN DOOR-SPRINGS.

Specification forming part of Letters Patent No. 139,458, dated June 3, 1873; application filed April 15, 1873.

To all whom it may concern: Be it known that I, DAVID DICK, ot'No.

397 Vl/'est street, New York city, in the` county of New York and Stat'ot New York, have invented certain new and useful Iml provements in Door-Springs; and I do hereby declare that the following is a full, clear,

' and exact description thereof,v reference being had to the accompanying drawings and to the letters of reference marked thereon which t'orm a part of this specification.

The invention consists in the combination of the cylinder, top cap, spring, and arm with lever and roller to form a door-spring, as hereinafter more fully described.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed tO describe its construction and operation, referring tO the annexed drawing, in which- Figure l is a perspective view of the upper part of a door, showing my door-spring applied to the same. Fig. 2 is a section of the springcase, showing the spring and the other parts connected therewith, and Fig. 3 shows the device -for regulating thel tension Of the spring. A represents the upper part of a door-frame with the` door B. 'lo a suitable bracket attached tothe door-frame A is secured a cylinder, C, in a vertical position, which cylinder contains a `spiral, spring, D. The cylinder 0 may be made in one piece with the bracket- Or separate and attached to it, as desired. It is located above the door and a short distance from the inner end of the door, as shown in Fig. 1. E represents the lower and G the upper cap of the cylinder, and from the latter attached to it extends a tube, a, down through the spring D, and rests On the lower cap E.

A screw, b, is then passed up from below and fastened by a nut, d, on top, as shown in Fig. 2. The upper end of thespring D is inserted in a hole, atx, in the upper cap Gr, while the lower end extends outward between the cylinder and lower cap E in the form o f an arm,

y, having its outer end bent downward to.

bear against a lever, H, which is placed with its inner end around the tube a, and projects out, also, between the cylinder and lower cap. 0n the'upper end of the door B is a bracket, I, carrying a anged roller, J, in which the lever H works.

It will readily be seen that from the'position and construction Of this door-spring the pressure on the door is strongest when closed and lightest when the door is open, the door being fulcrum in one position and the springi pressure fulcrum in the other. The top cap G is provided with ratchet-teeth e e on the l under side, and on the upper edge of the cylinder is one or more teeth, 1I, so that by turning the top cap the pressure ot' the spring may be increased or diminished at pleasure, the teeth retaining the pressure given. y

Having thus fully described my invention,

what I `claim as new, and desire to secure by Letters Patent, is- I u The combination of the cylinder C, top cap G, spring D, arm g/,flever H, and roller J, all

constructed as described, and arranged on the door-frame and door in the position and for the purposes herein set forth.

In testimony that I claim the foregoing as my own I aix my signature in presence of two witnesses.

DAVID DICK.

. Witnesses: GEO. S. THOMPSON, OHAs. MITTAM.

PATENT OFFICE. V 

